redirect & delay WordPress FEED url to FeedBurner

<?php
// To rewrite the feed links
add_filter('feed_link', 'my_feedburner_feed_link', 1, 2);
// To redirect feeds
add_action('template_redirect', 'my_feed_redirect');

function my_feed_redirect() {
    global $feed;
    // Change this
    $new_feed = 'https://feeds.feedburner.com/taxze';
 
    if (!is_feed()) {
        return;
    }
    if (preg_match('/feedburner|feedvalidator/i', $_SERVER['HTTP_USER_AGENT'] ?? '')){
        return;
    }
 
    if ($feed != 'comments-rss2') {
        if (function_exists('status_header')) status_header( 302 );
        header("Location:" . $new_feed);
        header("HTTP/1.1 302 Temporary Redirect");
        exit();
    }
}

function my_feedburner_feed_link($output, $feed){
    // Change this
    $new_feed = 'https://feeds.feedburner.com/taxze';
 
    if($feed!='comments-rss2'){
        $feed_array = array('rss' => $new_feed , 'rss2' => $new_feed , 'atom' => $new_feed , 'rdf' => $new_feed , 'comments_rss2' => $new_feed);
        $feed_array[$feed] = $new_feed;
        $output = $feed_array[$feed];
    }
    return $output;
}
?>

<?php
add_filter('posts_where', 'publish_later_on_feed');

function publish_later_on_feed($where) {
    global $wpdb;

    if ( is_feed() ) {
        // timestamp in WP-format
        $now = gmdate('Y-m-d H:i:s');

        // value for wait; + device
        $wait = '5'; // integer

        // http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html#function_timestampdiff
        $device = 'MINUTE'; //MINUTE, HOUR, DAY, WEEK, MONTH, YEAR

        // add SQL-sytax to default $where
        $where .= " AND TIMESTAMPDIFF($device, $wpdb->posts.post_date_gmt, '$now') > $wait ";
    }
    return $where;
}
?>

//exclude feed category
add_filter('pre_get_posts','tz_exclude_category_feed');
function tz_exclude_category_feed($query) {
    if ($query->is_feed) {
        $query->set('cat','-60');
    }
return $query;
}